batch

#!/usr/bin/env awk -f

BEGIN {
    "date +%s" | getline batch_time;
    close("date +%s");
    batch = "";
}
{
    "date +%s" | getline current_time;
    close("date +%s");
    if (batch_time == current_time) {
        batch = batch " " $1;
    }
    else {
        "date +%s" | getline batch_time;
        close("date +%s");
        print substr(batch, 2, length(batch)-1);
        batch = "";
    }
}
END {
    print substr(batch, 2, length(batch)-1);
}